Arginine ADP-riboxanase OspC3

UniProtKB accession:  A0A0H2US87

Grouped By:  Matching UniProtKB accession

UniProtKB description:  ADP-riboxanase effector that inhibits host cell pyroptosis (PubMed:23684308, PubMed:34409271, PubMed:34671164, PubMed:36624349). Acts by mediating arginine ADP-riboxanation of host CASP4/CASP11, blocking CASP4/CASP11 autoprocessing (PubMed:34671164, PubMed:35338844, PubMed:35568036, PubMed:36624349, PubMed:37014865). This prevents CASP4 activation and ability to recognize and cleave GSDMD, thereby inhibiting LPS-induced pyroptosis (PubMed:34671164, PubMed:36624349). ADP-riboxanation takes place in two steps: OspC3 first catalyzes ADP-ribosylation of target Arg, and then initiates a deamination to remove one N-omega group (PubMed:34671164). Independently of its ADP-riboxanase activity, acts as an inhibitor of calcium signaling by inhibiting host calmodulin, preventing activation of the JAK-STAT signaling pathway in response to interferon-beta (PubMed:35568036). Mechanistically, acts by binding to the apo form of calmodulin, preventing calcium-binding and ability to activate host CaMK2 (CAMKII), which is required to stimulate the JAK-STAT signaling pathway in response to interferon-beta (PubMed:35568036).